Well you definitely not watched Google I/O 2017 or 2018. Or you've never heard of Fuchsia or Google vs Oracle lawsuit over Android(a bit far to say at this moment though).
Dart is not dead(like Rust or other young programming languages), personally I don't like the language neither, but is the only language to write Flutter application so if you choose to use Flutter you have no choice.
So asking about the language itself is not a good idea IMO, just Dart = Flutter(like Swift = iOS). "Will learing Flutter bring me a brilliant future" could be a nice answer.
Of course the answer about your questions... "bright" industrial future thing is we don't know; If we really can predict your questions I'd rather be a fortune teller not a software engineer.
Based on my experience I can tell that using Flutter is nice for:
1. A small team but MUST create products running both on iOS/Android,
2. Compile-time error checking language with hot reload
3. Finding a dev. env. which is easy to install and perfectly integrated to popular IDEs
4. Business is mainly presenting products in catalogue-like view
5. Performant and difficult to gain a reverse engineered source code
6. Laughs everyday reading articles on
wtfjs.com
And if these are not in your case, just stick to your good old dev envs like Java/Kotlin or Objc/Swift or what's on.